To follow up, I took a look at clsql-fluid. Weblocks uses CLSQL wrong:

http://lists.b9.com/pipermail/clsql-help/2005-April/000416.h...

Although it's not at all obvious from the documentation that you should use the with-database macro:

http://clsql.b9.com/manual/with-database.html

I actually remember this tripped me up the first time I used CLSQL.